TY - JOUR
T1 - Doppler-tolerant receiver for an ultrasonic LPS based on Kasami sequences
JF - Sensors and Actuators A: Physical
Y1 - 2012
A1 - Fernando J. Álvarez
A1 - Álvaro Hernández
A1 - JA. Moreno
A1 - María del Carmen Pérez
A1 - Jesús Ureña
A1 - Carlos De Marzziani
AB - This paper presents the design of a novel receiver for a broadband ultrasonic Local Positioning System (LPS). As in other devices based on matched filtering of the transmitted encoded signals, this receiver features high robustness to noise and multiple access capability. Unlike previous solutions, the proposed receiver is capable of detecting beacons emissions despite being installed in a fast moving device, and it also provides estimation of its velocity. The system has been implemented in an FPGA-based architecture. An experimental analysis of performance has been carried out. Firstly using a set of test signals synthetically generated to simulate different positions and velocities of the receiver. Secondly, a set of real signals obtained with a prototype have been used. The simulated results show the capability of the system to detect the encoded signals emitted by the LPS infrastructure when the device is moving at velocities of up to 3 m/s under low SNR conditions. The real results confirm the improved system capability, but also make evident the negative influence that phenomena such as the transducers response and multipath propagation can have on system performance.
VL - 189
U2 - Escuela Politecnica Superior
U3 - University of Extremadura
University of Alcala
U4 -